Use variable in .map function javascript

Question

I have a map function and would like to pass in a variable as a Key such that the obj.item below takes the variable Salary to become Salary as the key instead of item.

weeklyData.map(function(obj) {
        var day = obj.day;
        var item = "Salary";
        if (day === "Day") {
          obj.item = "text"; // obj.item should be Salary as key
          obj = obj;
        };
        return obj;
      });

`item` is a string when did it changed to an object `item.text`? — Dalorzo, Dec 23 '16 at 20:41
I modified my real code, item is actually an object I used, edited above — Olli, Dec 23 '16 at 20:44

score 3 · Accepted Answer · answered Dec 23 '16 at 20:43

3

Just use bracket notation

obj[item] = "text";

This will set the key to whatever item holds, in your case Salary.

answered Dec 23 '16 at 20:43

baao

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score 1 · Answer 2 · answered Dec 23 '16 at 20:44

Try the following:

weeklyData.map(function(obj) {
        var day = obj.day;
        var item = "Salary";
        if (day === "Day") {
          obj[item] = "text";
        };
        return obj;
});

You don't need this line obj = obj;, you are working with the object reference.

Use variable in .map function javascript

2 Answers2